CImCombine:KwdWeightedMean
The KwdWeightedMean method combines the images by a weighted mean using the value of a header keyword as the weight.
CImage = CImCombine:KwdWeightedMean( CImageSet, sKeyword ) |
CImageSet contains the collection of images to be combined.
sKeyword is the name of the header keyword whose value is used as a weight.
CImage is a new image created by this method.
On success, this method returns a new CImage.
On failure, this method returns nil.
Each pixel in the output image is the mean value of all images using a normalized keyword value as the weight. For example, this method can be used to combine images in an "optimal" sense using the exposure time as a weighting factor. The keyword values are collected and normalized to unit weight.
Suppose a CImageSet named S exists. The following script combines the images by the KwdWeightedMean method using the exposure time keyword as a weight. The images are normalized by the Median statistic computed inside the central 10% of the image:
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-- create a CImCombine object |
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-- central 10% of the image |
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-- specify CImage and CRect to measure |
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-- use the MmClip as the normalization statistic |
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-- scale to normalize the image set |
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-- combine image set and return new image |
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-- show the new image |
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-- when done with S, remove it from memory |
CImCombine class, CImageSet class, CImage class, CRect class
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